lithium-ion

The battery begins with Volta's pile, but modern batteries evolved through chemistry, materials, portability, and rechargeable systems.

iPhone batteries degrade through cyclical charging—the repeated charge and discharge cycle that every rechargeable lithium battery experiences. After 500 full charge cycles, most iPhone batteries retain 80 percent capacity; after 1,000 cycles, 60 percent. Battery degradation is not a defect; it is the thermodynamic cost of using electrochemical energy storage. However, specific charging habits and software settings can extend battery lifespan and maximize daily runtime. The tactics are science-based: keeping batteries cool, charging to 80 percent rather than 100 percent, avoiding deep discharges, and managing background processes. Most battery drain myths are false (closing apps does not help; wi-fi does not drain faster than LTE). This guide separates fact from myth, explains the science of lithium-ion batteries, and provides specific settings and habits that work.

From Alessandro Volta's 1800 voltaic pile to the 2019 Nobel Prize for lithium-ion: how the battery became the defining technology of the portable power age.

How EV batteries work: lithium-ion cell chemistry, pack design, battery management, charging, aging, and where solid-state and sodium-ion cells stand.

The battery in your phone contains enough energy to seriously injure you. Understanding it reveals one of chemistry's most elegant solutions.

Solar and wind are cheap but not dispatchable. Grid-scale battery storage fills the gap for hours, not weeks. This article covers how the systems work, how fast costs fell, what Hornsdale and California showed, and where batteries still fall short.

Batteries store electrical energy as chemical energy and release it on demand. The principles are over 200 years old, but the chemistry inside your phone and your EV is still changing.